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Louis Christian De Preville
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Individual
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Individual
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14,867. PrÚville, L. C. de. June 27. Combined lift and force pumps. - Relates to combined lift and force pumps for wells &c., in which there are two pistons working in the cylinder on opposite sides of the outlet pipe. The lifting-piston 14 and the forcing- piston 19 have the same area, and are rigidly fixed to the pump rod 9, 9<1> so that the amount of work done on the up and down strokes is equal. A valve 8 is arranged in the piston 14 and a valve 20 in the outlet pipe 16.
GB190714867D1907-06-271907-06-27Improvements in Pumps.
ExpiredGB190714867A
(en)